Questions tagged [torque]

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3answers
35 views

How to power (from AC) & set varying overcurrent limits on the fly for 12 V DC motor

I am trying to use a 12 V geared down (high torque, low speed) motor in an exercise application. I want to be able to roughly adjust the load akin to adding more physical weights on a traditional ...
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1answer
54 views

DIY Ebike BLDB motor controller, low torque, is it my motor?

I've designed a 3 phase inverter for driving a BLDC hub motor. The design (if anyone wants to look at schematics, is here). This works well, the motor spins up and down fine, no worries. However, if I ...
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4answers
403 views

Can I use stall torque to calculate torque constant?

I'm using torque control for my project, and dc motor manufacturer doesn't give me the number of their motor's torque constant and motor resistance. I can use multimeter to measure the motor's ...
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3answers
104 views

How can this BLDC motor have constant torque over its RPM range?

I was going through this catalogue of BLDC motors for my EV project. I found two motors in it, one rated at 2.5 kW of peak power, and the other 6 kW of peak power. My questions are as follows: It is ...
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0answers
37 views

Torque developed by Star Connected rotor

The current in each phase of a Y-connected rotor winding is 200 amperes. The resistance per leg is 0.003 ohm. Determine the torque developed by the rotor at a slip of 3%. I don't understand how to ...
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1answer
43 views

Motor power, torque and RPM importance (simulator steering wheel) [closed]

I would like to build a DIY racing simulator steering wheel very similar to this one. My question is, how will the specifications of the motor used affect the experience at the wheel after the pulley ...
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1answer
44 views

How to determine if a motor will be powerful enough to drive a drift trike

I am planning on building a drift trike and I am trying to work out the best motor to use that is right for my budget. I have seen: a 2000w (48v - 4300RPM - 4.44 N.m torque) a 1000w (48v - 3000 RPM -...
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3answers
540 views

About the torque-free charging operation

I and one of my friends are working on understanding the below context (paper link): The study provides an extensive overview of on-board integrated chargers for electric vehicles that are based on ...
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0answers
38 views

Why don't I get a bell curve in the torque vs rotor position plot?

I have designed a inset PMSM. I tried to plot the torque vs. rotor position plot but I am not getting a bell curve. Like at the torque must be maximum only when theta is 90 degrees. I don't know where ...
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3answers
57 views

Is it best practice to use motor drivers that supply continuous current greater than the stall current of the motor?

Note I am a beginner :) I have this 300RPM motor: https://uk.banggood.com/CHIHAI-MOTOR-GM25-370-DC-Gear-Motor-6V-100210300RPM-Encoder-Motor-p-1016183.html?cur_warehouse=CN&ID=519629&rmmds=...
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2answers
70 views

Underwater train project's battery powered DC/BLDC/Stepping motor gear/non gear requirements and water proof sealing problem

I am a software developer by trade, having put together a few beginner Arduino projects and such. My next project entails an underwater roller-coaster (without loops, just going over the surface, so ...
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2answers
30 views

TRT-25 and Arduino Uno

I need help on a project I am working on. We are trying to integrate a reaction torque sensor and I am having a hard time deciding how to go about it. Previously I assumed that like my load cell I ...
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1answer
84 views

Does "rated torque" (kg.cm) directly apply to "lead screws"? [closed]

I am making a project that requires driving nuts through threaded rods. I keep seeing different numbers for kg.cm and N.m, the explanation kg.cm found on this Stack emphasized only on radial distance, ...
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2answers
85 views

DC Motor, Torque vs RPM

I am making a pulley system (for an electric bike) that requires about 300rpm and 40lb-inch torque. The motor that I am looking at is a 24V DC Permanent Magnet Electric Motor Generator 250W 2750RPM ...
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2answers
126 views

In absence of leakage, what creates the angle between stator and rotor flux in an induction machine?

As per my understanding to produce torque from a machine, we need an angle between stator and rotor flux. In an induction machine rotor flux is created in response to stator flux, why is there an ...
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2answers
134 views

How much suspended weight and how far down would it need to be lowered in order to generate 100 kWh?

I am working on a 100 kWh capacity gravity battery bank. How much suspended weight and how far down would it need to be lowered in order to generate 100 kWh? How many kWh would it take to lift the ...
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2answers
72 views

Measure torque with a BLDC motor

I'm trying to build a bench test in order to measure the torque required to put and keep in rotation a brake which function with friction. The rotational speed for this test is slow (15 RPM) to be ...
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1answer
72 views

How is the feedback estimated in the torque mode control of a servo motor?

The torque mode control of a servo motor requires the feedback of the current torque generated by the motor in order to compare it against the torque reference signal. Is the product \$K_t I\$ of the ...
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0answers
34 views

Is torque constant times the motor current the only way to estimate torque feedback in a servo motor?

Consider a torque and position tracking servo motor. Once the motor reaches the target position (assume no external torque applied), the end effector should apply a torque which tracks the torque ...
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2answers
54 views

What happens when the motor torque is constant and the load torque suddenly decreases?

It is a situation where the load torque (Ta) suddenly decreases while rotating the shaft with a motor(PMSM) at a constant motor torque (Tm). In my opinion, the rotational speed of the shaft (I-moment ...
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1answer
56 views

Accurate Static Pulling (with electric motor?)

I am trying to see if I could accurately apply a static pull to a cord to create tension. I should not be measuring the tension directly, only be sure that the pull I apply is the force in Newtons ...
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0answers
46 views

Is it possible to regulate the amount of counter torque in a generator?

I have a question for a machine I am working on, The machine is used to pre-tension steel wire ropes for maritime uses, the wire rope sits on a drum with a 2m diameter. The tension has to be ...
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1answer
99 views

Torque Control of DC fan using Arduino

I am trying to control the torque of a 24V-DC fan (datasheet) using an arduino. A control system with feedback must be setup to continuously check the torque of the motor and correct it, if the value ...
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1answer
80 views

finding the right torque and motors

I am trying to find the right motors for the following case: I want to have a total of two motors on opposite sides of a board. The board will have a maximum weight of 150kg (330 lbs) and needs to ...
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1answer
48 views

Current Driven DC Motor

For a work school project of mine, I am trying to make a self-balancing robot. I am using these Pololu DC motors and my 4s Lithium Ion battery pack outputs 15.7V at a rated 2Ah. Currently I am using ...
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6answers
259 views

Are we controlling the speed or torque when we press the accelerator pedal in an electric car?

In this video, at 16:23, the presenter says that when we press the accelerator pedal in an electric car, we are "commanding torque and not speed". I'm confused here, aren't we making the car ...
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2answers
118 views

Producing a small homemade generator with reduced cogging torque

Background: I'm working on my second hobby small generator design. Particularly difficult to source are (relatively) low speed permanent magnet motors that can be run in reverse as a generator with ...
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3answers
143 views

Is it possible to use an electrical motor with a constant torque while simultaneously turning against it?

I've been thinking about whether it is possible to have an electrical motor output a constant torque against which one can then apply a force without breaking the motor? I guess the best example would ...
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0answers
45 views

How to make a synchronous generator unstable

I was try to analyse what factors can affect the stability of synchronous generator . Let's say a synchronous generator working in isolation and some loads are connected to it and we have to make it ...
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1answer
41 views

Steady State speed of rotor in following doubly excited system

I'm trying to analyse following system - A three phase armature winding on stator and on rotor field winding and both stator and rotor are cylindrical . And armature winding is connected to a three ...
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1answer
58 views

Counter torque in alternator supplying reactive power

When an alternator(assume zero armature resistance and iron loss) is supplying purely lagging/leading current, which means there is no work done by the current supplied, does that mean the counter ...
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1answer
39 views

Servo and power supply problems

I'm new to Arduino so baby language for me please :) Problem: I'm trying to power 2 servos (https://www.amazon.co.uk/gp/product/B07DQFXDC9/ref=ppx_yo_dt_b_asin_title_o07_s00?ie=UTF8&psc=1) but ...
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1answer
43 views

Stepper Motor angle after gear

I wanted to ask a relatively simple question: Currently I am using a 3 phase AC motor that has a Gearbox torque of 5.1 Nm. A 16 teeth gear is attached to the shaft and this is connected to a 72 teeth ...
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0answers
126 views

Universal motor torque measurement

I would like to control AC universal motor (brushed). I would like to know the load torque, but I cannot measure the torque directly. I have to calculate it from motor parameters. Please let me know ...
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3answers
156 views

Why don't *small* electric cars use small cheap hobby motors? [closed]

The automotive blogger Jason Torchinsky recently bought an inexpensive electric car, a Changli Nemeca, whose motor he describes as being powered by five car batteries and producing 1.1 horsepower (820 ...
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1answer
760 views

How to calculate the torque constant for a BLDC motor

I am designing a 12lb hobby robot with a 1000Kv BLDC motor at 14.8V nominal voltage and stall torque of 30A. How do I solve for the torque constant. I have seen equations where Kt(torque constant) = 1/...
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1answer
46 views

Why slip is negative in this plot?

I have the following plot (please see first 2 plots below). The asynchronous motor is working as a generator. I wonder why the slip is going negative, is it because the torque also goes negative? Like ...
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1answer
45 views

How reliable are motor power ratings through time (old motors vs new motors)?

I'm making this question here because I'm a little bit confused with what I've been seeing from some old and new 1/2 hp motors. I've bought a 1/2 hp induction motor (4-pole, single phase, capacitor ...
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1answer
170 views

What is the best way to measure and record the power consumption of a servo motor accurately?

I can obtain the rotational angle and velocity of a servo motor. However, I cannot obtain the current nor torque while the motor is turning. What is the best way to measure the power consumption of a ...
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1answer
47 views

BLDC Motor question

Im looking for a solution, i have a 3kW 320V 3000rpm rated BLDC motor with position hall encoder and a chinese driver. The hall-feedback is working with it. I would like to use motor between 15 and ...
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2answers
296 views

Using a motor as a brake

I want to use the motor of an electric vehicle as a brake. It is a 36V ~27A motor. I looked up 500W+ resistors and they are quite pricey, I figured the cheapest alternative would be 100W resistors in ...
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1answer
327 views

Old Record Player Motor Doesn't Have Torque To Start

I am restoring a jukebox from 1953 (AMI E-120). Everything is going fine except the main drive motor, an A/C induction motor, cannot start under the load of the platter. It starts fine when the ...
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2answers
166 views

Do Induction Motors only work if the rotor's coils have a finite resistance?

I just did some calculations, and to me it seems that the induction motor only works when the rotors coils have finite resistance: I will show that for a single conducting loop, whose current is ...
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2answers
536 views

Relationship between torque and back-EMF voltage | BLDC motor modeling

I want to simulate an BLDC motor, so I am studying corresponding mathematical model. My problem is that I am little bit confused by the torque equation. \$e_a\$, \$e_b\$, \$e_c\$ - Back-EMF voltages (...
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3answers
178 views

How do i know what resistor value, that's attached to a BLDC motor, i should use in order to get a torque of 100 lb-ft put on my actuator?

Motor P/N is M-3441Y-LN-02D. Back EMF [Ke] is 38.95 (Vpeak/Krpm). Continuous torque 2.495 lb-ft. User manual. I want to run the actuator coupled with the BLDC motor 60:1 gear ratio in reverse. So the ...
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3answers
162 views

How can these two motors produce the same torque if their volt/amp ratings are different and their watts/RPM are the same

My rudimentary understanding of a DC brushed motor is speed is proportional to voltage and torque is proportional current. Therefore a 36 volt 500 watt motor should have a higher RPM rating and a ...
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2answers
503 views

Torque and Flux Current

It is said that vector sum of flux and torque current equal to total current drawn by the motor but there are also some currents flowing due to copper losses and rotor leakage inductance. In my ...
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2answers
3k views

How to electrically brake a brushless motor

I'm sorry if this question is too stupid, unfortunately I have a very low experience with BLDC motors. I would like to use 4 x 350W, 24VDC brushless motor hubs for my wheeled robot (they are usually ...
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2answers
60 views

How Can I Efficiently Adjust Difficulty on a Pedal Generator without Mechanical Gears?

I'm charging a battery using pedal power, like this: pedals -> brushless generator -> rectifier -> charge controller -> battery I'd like to be able to ...
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1answer
88 views

Rotor Current and Torque Producing Current in Induction Motor

Is rotor current of an Induction motor always same with torque producing current? In torque equation of Induction motor, there is also one factor called rotor power factor. if rotor current and torque ...

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